TRIO 12 Front loaded Horn Subwoofer - diyAudio
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Old 16th June 2010, 12:14 PM   #1
Mark Kravchenko --- www.kravchenko-audio.com
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Default TRIO 12 Front loaded Horn Subwoofer

Hello Gents.

I post a newly designed and constructed horn loaded subwoofer. It uses the CSS TRIO8 driver and a meager 4 sheets of material to make a horn solid down to 18hz. Tell me what you think.

The pics are here: Horn Subwoofer pictures by mwmkravchenko - Photobucket



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Old 16th June 2010, 12:19 PM   #2
Mark Kravchenko --- www.kravchenko-audio.com
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Here are the input specs from Hornresp:
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Old 16th June 2010, 04:07 PM   #3
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Click the image to open in full size.

Wow! Thats some high compression!
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Old 16th June 2010, 04:41 PM   #4
Mark Kravchenko --- www.kravchenko-audio.com
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Not really. 4.73 to 1. So it is actually quite gentle. The internal area ther is 1 1/2'' x 15 1/2''

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Old 16th June 2010, 07:05 PM   #5
MartinQ is offline MartinQ  Canada
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Originally Posted by mwmkravchenko View Post
Not really. 4.73 to 1. So it is actually quite gentle.
Hold up ... when did 5:1 compression in a horn-sub get labeled as gentle? We're not talking about engines here.
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Old 16th June 2010, 07:31 PM   #6
jbell is offline jbell  United States
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In comparison to my dual MCM 55-2421 horns at 8:1.... under 5 IS gentle.
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Old 16th June 2010, 09:18 PM   #7
MartinQ is offline MartinQ  Canada
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I suppose if the motor can drive it and the cone can take it ... why not.

I always thought 3:1 and under was gentle.
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Old 16th June 2010, 10:40 PM   #8
Mark Kravchenko --- www.kravchenko-audio.com
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I suppose if the motor can drive it and the cone can take it ... why not.

I always thought 3:1 and under was gentle.
The rule of thumb for pro work is 3 to 1. This motor and the cone are very well behaved at this compression ratio of more or less 5 to 1. Just back in from the shop doin some testing. I'm using a flea power amp at the moment and it is indeed a beast. You can count the beats on a 32 ft low C on a pipe organ! And that is in the middle of my shop off of the floor. Very poor boundary loading at the moment. But it still speaks with great authority.

The trade off in compression ratio is that the larger you make the throat the larger the horn must be overall to support a clean wave front. This horn is just under Half wavelength of 16hz at 23 feet long. !/2 wavelength is 32 feet for 16 hz. So it is already big enough. This is a permanet installation type of an enclosure. One you hide away and scare the guests with!

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Old 16th June 2010, 11:46 PM   #9
GM is offline GM  United States
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Oooh, my kind of horn! Yeah, for relatively low power apps, I experimented with up to ~10:1 CR using an accordion surround driver that was stiffened up with a spray epoxy coating. I figured if WE/Altec's small format compression driver's paper thin aluminum diaphragm could handle 30 W continuous it seemed reasonable to me that a 75 W rated point source mid-bass driver could too when horn loaded. Don't know if it could or not, at ~108 dB efficient/100 Hz it was loud enough hooked to an old AM tabletop radio that I called it a success without bothering to hook it up to a high power amp.

So, you planning on doing a TH to see if it can compete/best it in less bulk?

GM
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Old 17th June 2010, 12:00 AM   #10
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Originally Posted by mwmkravchenko View Post
Hello Gents.

I post a newly designed and constructed horn loaded subwoofer. It uses the CSS TRIO8 driver and a meager 4 sheets of material to make a horn solid down to 18hz. Tell me what you think.

The pics are here: Horn Subwoofer pictures by mwmkravchenko - Photobucket



Mark
Nice work. What do you think of the Trio12 driver btw? It's high up on my "drivers I'd like to try" list...
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